Adapter, end cover assembly and battery

Abstract

The utility model relates to an adapter, an end cover assembly and a battery. The adapter is used for connecting the tab and the electrode terminal, the adapter comprises a first surface and a second surface which are oppositely arranged in the thickness direction, the first surface is configured to be welded to the electrode terminal through laser, the second surface is configured to be connected to the tab, and the second surface is provided with a laser nick formed through laser etching. The laser etching technology belongs to non-contact machining, the problems of mechanical stress, cracks, work hardening and the like of the adapter can be avoided, the second surface is etched to form the laser nicks through the laser etching technology, the roughness of the second surface is increased, laser absorption of the adapter and the electrode terminal during laser welding is facilitated, and the laser welding quality is improved. And the laser welding strength and efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to an adapter, an end cap assembly, and a battery. Background Art

[0002] Laser welding has the characteristics of high efficiency and low cost, and is commonly used in the metal connection process of power batteries. For example, reliable connection can be achieved by laser penetration welding between the pole column of a power battery and an adapter. However, the metals used for the adapter (such as aluminum alloy, red copper, etc.) have relatively low laser absorption rates, which is not conducive to the direct welding of the pole column and the adapter.

[0003] In related technologies, densely arranged concave dimple embossing is usually processed on the surface of the adapter by using a mold to improve the laser welding effect. However, affected by the mold and the stamping process, it is very difficult to control the consistency of the depth and density of the embossing, and mold stamping is likely to cause problems such as cracks, thinning of the adapter, and large mechanical stress and work hardening in the stamped part, which affect the subsequent laser welding. Summary of the Utility Model

[0004] Based on this, it is necessary to provide an adapter, an end cap assembly, and a battery for the above technical problems.

[0005] In the first aspect of the present application, an adapter is provided. The adapter is used to connect a tab and an electrode terminal. The adapter includes a first surface and a second surface that are oppositely arranged in the thickness direction. The first surface is configured to be laser welded to the electrode terminal, and the second surface is configured to be connected to the tab. The second surface has laser marks formed by laser etching.

[0006] Laser etching technology belongs to non-contact processing, which can avoid problems such as mechanical stress, cracks, and work hardening of the adapter. By using laser etching technology to etch laser marks on the second surface of the adapter facing away from the electrode terminal, the roughness of the second surface of the adapter irradiated by the laser is increased, which is beneficial to the laser absorption during the laser welding of the adapter and the electrode terminal, helps to improve the efficiency and strength of the laser welding, and because the diameter of the laser beam used in the laser etching technology is small, the laser marks on the second surface are denser and the consistency of the laser marks is better, so that the consistency of the laser absorption of the adapter is higher, increasing the consistency of the laser welding and improving the welding strength.

[0007] In one embodiment, the first surface is a flat surface.

[0008] In one embodiment, the depth of the laser mark is less than or equal to 1 / 10 of the thickness of the adapter.

[0009] In one embodiment, the cross-section of the laser engraving along the thickness direction includes a first end and a second end arranged oppositely, the first end is farther from the first surface than the second end, and the size of the first end is larger than that of the second end.

[0010] In one embodiment, the width of the second end is 0.01 mm - 0.4 mm, and the interval between the first ends of adjacent laser engravings is 0.01 mm - 0.4 mm.

[0011] In one embodiment, the cross-section of the laser engraving along the thickness direction further includes a first side, the first side is disposed between the first end and the second end, and the included angle between the first side and the thickness direction is 1° - 60°.

[0012] In one embodiment, the laser engraving includes a first laser engraving and a second laser engraving, the first laser engraving and the second laser engraving intersect with each other, and the included angle between the first laser engraving and the second laser engraving is 45° - 90°.

[0013] The second aspect of the present application provides an end cap assembly, and the end cap assembly includes: an end cap plate; an electrode terminal, the electrode terminal is connected to the end cap plate; and the adapter as described above, the first surface of the adapter is laser welded to the electrode terminal.

[0014] In one embodiment, the laser engravings cover the entire second surface; or, the laser engravings are arranged on the second surface corresponding to the welding area of the first surface.

[0015] The third aspect of the present application provides a battery, and the battery includes: an electrode assembly, the electrode assembly includes a tab; a housing, the housing is used to accommodate the electrode assembly; and the end cap assembly as described above, the end cap assembly is connected to the housing so that the electrode assembly is enclosed in the housing, and the second surface of the adapter is connected to the tab. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of a battery in an embodiment of the present application.

[0017] Figure 2 It is an exploded view of the battery in an embodiment of the present application from the first perspective.

[0018] Figure 3 It is an exploded view of the battery in an embodiment of the present application from the second perspective.

[0019] Figure 4 It is a schematic diagram of the adapter in an embodiment of the present application.

[0020] Figure 5 It is a schematic diagram of the cross-section of the laser engraving in an embodiment of the present application.

[0021] Figure 6Schematic diagram of an adapter in an embodiment of the present application, where the laser engraving includes a first laser engraving and a second laser engraving.

[0022] Figure 7 is Figure 6 Partial enlarged view of area A in [the figure].

[0023] Description of reference numerals:

[0024] 100. Battery; 10. Electrode assembly; 11. Tab; 111. First tab; 112. Second tab; 20. Housing; 30. End cover assembly; 31. End cover plate; 311. Positioning protrusion; 32. Electrode terminal; 321. First electrode terminal; 322. Second electrode terminal; 323. Third surface; 324. Fourth surface; 33. Adapter; 331. First surface; 332. Second surface; 3321. Laser engraving; 3321a. First end; 3321b. Second end; 3321c. First side; 3321d. First laser engraving; 3321e. Second laser engraving; 333. Welding part; 334. Limiting part. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present application more obvious and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0027] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "a plurality" appears, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0031] Refer to Figures 1 to 3 , Figures 1 to 3 shows a schematic diagram of a battery 100 in an embodiment of this application. In some embodiments, the battery 100 includes an electrode assembly 10, a housing 20, and an end cap assembly 30.

[0032] The electrode assembly 10 is an important component of the battery 100 and is the part where the electrochemical reaction of the battery 100 occurs. The electrode assembly 10 can be one or more. The electrode assembly 10 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet (not shown), and a separator is usually provided between the positive electrode sheet and the negative electrode sheet.

[0033] Both the positive electrode sheet and the negative electrode sheet have a substrate and a tab 11. An active material layer is coated on the substrate, and the tab 11 is connected to the substrate. Generally, the tab 11 is made of a conductive metal material, and the tab 11 undertakes the function of transmitting current, transferring the electrical energy inside the battery 100 to an external load or transferring the electrical energy of the external load to the battery 100. The tab 11 includes a first tab 111 connected to the positive electrode substrate and a second tab 112 connected to the negative electrode substrate. The first tab 111 and the second tab 112 can be located at one end of the electrode assembly 10 together or at both ends of the electrode assembly 10 respectively. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 11 is connected to the end cap assembly 30 to form a current loop.

[0034] The housing 20 is used to form the internal environment of the battery 100. The formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte and other components, and provide support and protection for the electrode assembly 10, the electrolyte and other components. Generally, the housing 20 is provided with an open end to facilitate putting the electrode assembly 10, the electrolyte and other components into the housing 20. The housing 20 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 20 can be determined according to the specific shape and size of the electrode assembly 10. The material of the housing 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0035] The end cap assembly 30 is connected to the housing 20 to close the open end of the housing 20, forming a closed internal environment, thereby sealing and fixing the electrode assembly 10 in the housing 20, isolating the internal environment of the battery 100 from the external environment, and helping the battery 100 to be used normally for a long time.

[0036] In some embodiments, refer to Figure 2 and Figure 3, the end cap assembly 30 includes an end cap plate 31, an electrode terminal 32, and an adapter 33. The end cap plate 31 is connected to the open end of the housing 20 to enclose the housing 20, so that the electrode assembly 10 is stably accommodated in the housing 20. Without limitation, the shape of the end cap plate 31 can be adapted to the shape of the housing 20 to cooperate with the housing 20. Optionally, the end cap plate 31 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap plate 31 is not easily deformed when subjected to extrusion and collision, enabling the battery 100 to have higher structural strength and improved safety performance.

[0037] The electrode terminal 32 is used to electrically connect to the electrode assembly 10 for inputting or outputting the electrical energy of the battery 100. The electrode terminal 32 is fixed on the end cap plate 31. Feasibly, the electrode terminal 32 and the end cap plate 31 are integrally formed. The tab 11 includes a first tab 111 and a second tab 112. Correspondingly, the electrode terminal 32 includes a first electrode terminal 321 and a second electrode terminal 322. The first electrode terminal 321 is connected to the first tab 111, and the second electrode terminal 322 is connected to the second tab 112. Thus, the first tab 111 is electrically connected to the first electrode terminal 321, and the second tab 112 is electrically connected to the second electrode terminal 322 to form a current loop.

[0038] The adapter 33 is used to realize the connection between the electrode terminal 32 and the tab 11, avoid damaging the tab 11 and the electrode terminal 32 when directly connecting the tab 11 and the electrode terminal 32, ensure the stability of the connection between the electrode terminal 32 and the tab 11, and the adapter 33 can electrically connect the tab 11 and the electrode terminal 32. Thus, the current is transmitted from the electrode to the tab 11, from the tab 11 to the adapter 33, from the adapter 33 to the electrode terminal 32, and from the electrode terminal 32 to the external load, ensuring the normal operation of the battery 100 and current transmission. Generally, the adapter 33 is prepared from a metal material with good electrical and thermal conductivity (such as aluminum alloy, copper alloy, etc.). The adapter 33 and the electrode terminal 32 are connected by laser penetration welding.

[0039] The following is a detailed introduction to the adapter 33 in the present application.

[0040] In some embodiments, refer to Figures 2 to 5 , the adapter 33 includes a first surface 331 and a second surface 332 that are oppositely arranged in the thickness direction. The first surface 331 faces the electrode terminal 32, and the first surface 331 is laser welded to the electrode terminal 32. The second surface 332 faces away from the electrode terminal 32, and the second surface 332 is connected to the tab 11. The second surface 332 has a laser engraving 3321 formed by laser engraving. The laser engraving 3321 is used to increase the laser absorption rate of the adapter 33.

[0041] Laser etching technology belongs to non-contact processing. By utilizing the high energy density of the laser, the original material of the adapter 33 is precisely removed on the second surface 332 of the adapter 33 to form laser marks 3321, thereby changing the roughness and surface topography of the second surface 332, and thus changing the surface energy absorption rate of the second surface 332, which can avoid problems such as mechanical stress, cracks, and work hardening of the adapter 33.

[0042] Laser marks 3321 are etched on the second surface 332 of the adapter 33 facing away from the electrode terminal 32 through laser etching technology, increasing the roughness of the second surface 332 of the adapter 33 irradiated by the laser, effectively increasing the absorption of laser energy on the surface of the adapter 33, which is beneficial to the laser welding of the adapter 33 and the electrode terminal 32, improving the efficiency and quality of laser welding. And because the diameter of the laser beam used in laser etching technology is small, the laser marks 3321 on the second surface 332 are denser and the consistency of the laser marks 3321 is better, so that the consistency of laser absorption of the adapter 33 is higher, increasing the consistency of laser welding and improving the welding strength.

[0043] Furthermore, the laser marks 3321 formed by laser etching can also provide more contact points and surface areas, enhancing the mechanical fixity and thermal conductivity between the adapter 33 and the tab 11, thereby improving the stability and strength of the welded connection between the adapter 33 and the tab 11.

[0044] Specifically in this embodiment, the first surface 331 is a plane. The first surface 331 is the surface that fits the electrode terminal 32. By not processing the first surface 331, the adapter 33 can maintain a certain thickness and strength, avoiding the reduction of the strength of the adapter 33 due to laser marks 3321 on both surfaces of the adapter 33, and helping to avoid excessive thinning of the thickness of the adapter 33, which may cause penetration of the adapter 33 or even the electrode terminal 32 during laser welding.

[0045] Preferably, the depth H1 of the laser marks 3321 is less than or equal to 1 / 10 of the thickness H2 of the adapter 33, so that both the absorption rate of the laser is increased through the laser marks 3321, improving the strength of laser welding, and the adapter 33 still has a relatively high strength, avoiding the laser from directly acting on the electrode terminal 32 by penetrating the adapter 33. Optionally, the thickness H2 of the adapter 33 is 0.2 mm - 4 mm.

[0046] In some embodiments, refer to Figure 4 and Figure 5, the cross-section of the laser scribing 3321 in the thickness direction includes a first end 3321a and a second end 3321b which are oppositely arranged. The first end 3321a is farther from the first surface 331 than the second end 3321b, and the size of the first end 3321a is larger than that of the second end 3321b, that is, the laser scribing 3321 with an upper-wide and lower-narrow structure is formed. The upper-wide and lower-narrow structure may include a trapezoid, a V shape or a U shape.

[0047] By forming the laser scribing 3321 with an upper-wide and lower-narrow structure, when the laser is vertically irradiated on the surface of the laser scribing 3321, an incident angle less than 90° will be formed with the surface of the laser scribing 3321, so that the laser will be reflected in the laser scribing 3321, increasing the absorption of the laser by the second surface 332.

[0048] Preferably, the width L1 of the second end 3321b is 0.01 mm - 0.4 mm, that is, the size of the bottom of the laser scribing 3321 is small, avoiding too much laser reflected from the bottom of the laser scribing 3321, which in turn affects the absorption rate of the laser by the second surface 332.

[0049] Preferably, the interval L2 between the first ends 3321a of adjacent laser scribings 3321 is 0.01 mm - 0.4 mm, that is, the interval L2 between adjacent laser scribings 3321 is small, avoiding a large plane between the laser scribings 3321 that reflects too much laser and affecting the absorption rate of the laser by the second surface 332.

[0050] Furthermore, the cross-section of the laser scribing 3321 in the thickness direction further includes a first side 3321c. The first side 3321c is disposed between the first end 3321a and the second end 3321b, and the angle α between the first side 3321c and the thickness direction is 1° - 60°. Thus, the laser irradiated on the first side 3321c will be emitted by the first side 3321c into the laser scribing 3321, and the laser will be repeatedly irradiated and reflected inside the laser scribing 3321, increasing the absorption rate of the laser by the second surface 332.

[0051] In some embodiments, refer to Figure 6 and Figure 7, The laser scribing 3321 includes a first laser scribing 3321d and a second laser scribing 3321e, and the first laser scribing 3321d and the second laser scribing 3321e intersect with each other. The first laser scribing 3321d and the second laser scribing 3321e distributed by intersection can further increase the roughness and effective surface area of the second surface 332, enabling the laser to be more effectively absorbed by the adapter 33, thereby making the welding process between the adapter 33 and the electrode terminal 32 more stable and efficient. Moreover, the first laser scribing 3321d and the second laser scribing 3321e can increase the heat exchange surface area between the adapter 33 and the surrounding environment, thereby promoting heat conduction, reducing thermal stress and deformation, and improving the stability and controllability of welding. Optionally, the included angle between the first laser scribing 3321d and the second laser scribing 3321e is 45° - 90°. In other embodiments, the laser scribing 3321 may only include the first laser scribing 3321d or the second laser scribing 3321e.

[0052] Optionally, the laser scribing 3321 covers the second surface 332, or the laser scribing 3321 is only arranged on the second surface 332 corresponding to the welding area of the first surface 331.

[0053] In a feasible embodiment, the adapter 33 includes a welding portion 333, and the welding portion 333 is used for welding connection with the electrode terminal 32 and the tab 11. The first surface 331 of the welding portion 333 is connected to the electrode terminal 32 by laser welding, and the second surface 332 of the welding portion 333 is connected to the tab 11 by ultrasonic welding.

[0054] Furthermore, referring to Figure 2 and Figure 4 , the adapter 33 further includes a limiting portion 334. The limiting portion 334 is connected to the welding portion 333, and the limiting portion 334 is used to achieve the alignment connection between the adapter 33 and the electrode terminal 32. Specifically, a positioning protrusion 311 is provided on the surface of the end cover plate 31 facing the adapter 33, and the limiting portion 334 is configured as a positioning groove matching the positioning protrusion 311. When the positioning groove is connected to the positioning protrusion 311, the welding portion 333 can be aligned with the electrode terminal 32, which helps the welding between the adapter 33 and the electrode terminal 32, such as setting a U-shaped positioning groove to match the U-shaped protrusion of the adapter 33.

[0055] Furthermore, an installation groove is formed in the electrode terminal 32 in a direction away from the adapter 33. The welding portion 333 of the adapter 33 protrudes from the limiting portion 334 in a direction towards the electrode terminal 32, and the first surface 331 of the welding portion 333 protrudes from the first surface 331 of the limiting portion 334, so as to prevent the inversion of the first surface 331 and the second surface 332 during installation, which may affect the welding strength.

[0056] In other embodiments, the adapter 33 may be provided with a positioning groove on the first surface 331 of the limiting portion 334, and a positioning protrusion matching the positioning groove is provided on the surface of the end cover plate 31 facing the adapter 33, so as to avoid the inversion of the first surface 331 and the second surface 332 during positioning and improve the welding efficiency.

[0057] In an embodiment of the present application, the electrode terminal 32 includes a third surface 323 and a fourth surface 324 which are oppositely arranged. The third surface 323 faces away from the adapter 33 and is arranged outside the end cover plate 31, and the fourth surface 324 faces the adapter 33.

[0058] When the battery 100 is assembled and fixed, it includes the following steps: placing the electrode assembly 10 in the housing 20; assembling the end cover assembly 30. Specifically, fixing the electrode terminal 32 to the end cover plate 31, and then fixing the first surface 331 of the adapter 33 to the fourth surface 324 of the electrode terminal 32 by laser penetration welding to complete the assembly of the end cover assembly 30; connecting the end cover assembly 30 and the electrode assembly 10. Specifically, fixing and connecting the second surface 332 of the adapter 33 to the ear 11 by ultrasonic welding; connecting the housing 20 and the end cover assembly 30. Specifically, connecting the end cover plate 31 to the housing 20 to complete the assembly of the battery 100. The electrode assembly 10 transmits electrical energy to an external load through the ear 11, the adapter 33 and the electrode terminal 32 in sequence.

[0059] It should be noted that the order of the steps of assembling the end cover assembly 30, placing the electrode assembly 10 in the housing 20, and connecting the end cover assembly 30 and the electrode assembly 10 is not limited. For example, first assemble the end cover assembly 30, then connect the end cover assembly 30 and the electrode assembly 10, and finally place the electrode assembly 10 connected to the end cover assembly 30 in the housing 20; or first assemble the end cover assembly 30, then place the electrode assembly 10 in the housing 20, and finally connect the end cover assembly 30 and the electrode assembly 10; or first place the electrode assembly 10 in the housing 20, then assemble the end cover assembly 30, and finally connect the end cover assembly 30 and the electrode assembly 10.

[0060] A laser etching technique is used to etch laser marks 3321 on the second surface 332 of the adapter 33 facing away from the electrode terminal 32, increasing the roughness of the second surface 332 of the adapter 33 irradiated by the laser, effectively increasing the absorption of laser energy on the surface of the adapter 33, facilitating the laser welding of the adapter 33 and the electrode terminal 32, improving the efficiency and quality of laser welding. Moreover, since the diameter of the laser beam used in the laser etching technique is small, the laser marks 3321 on the second surface 332 are denser and the consistency of the laser marks 3321 is better, thus making the consistency of laser absorption of the adapter 33 higher, increasing the consistency of laser welding, and improving the welding strength.

[0061] Laser penetration welding is performed through the adapter 33 and the electrode terminal 32, eliminating the need for further processing of the adapter 33. Moreover, laser welding is a non-contact welding method with high welding efficiency, high machining precision, and high automation degree, enabling the adapter 33 and the electrode terminal 32 to have reliable connection strength, thereby reducing the production cost of the battery 100, improving the production efficiency of the battery 100, and enhancing the production quality of the battery 100.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0063] The above-described embodiments merely represent several implementation manners of the present application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A transfer piece, used to connect a tab and an electrode terminal, characterized in that: The adapter includes a first surface and a second surface arranged opposite to each other in a thickness direction, the first surface is configured to be laser welded to the electrode terminal, the second surface is configured to be connected to the tab, and the second surface has laser marks formed by laser etching.

2. The adapter according to claim 1, characterized in that: The first surface is a plane.

3. The adapter according to claim 1, characterized in that: The depth of the laser scoring is less than or equal to 1 / 10 of the thickness of the adapter.

4. The adapter according to claim 1, characterized in that: The cross section of the laser score along the thickness direction includes a first end and a second end that are oppositely disposed, the first end is farther away from the first surface than the second end, and the size of the first end is larger than the size of the second end.

5. The adapter according to claim 4, characterized in that: The width of the second end is 0.01 mm-0.4 mm, and the interval between the first ends of adjacent laser marks is 0.01 mm-0.4 mm.

6. The adapter according to claim 4, characterized in that: The cross section of the laser mark along the thickness direction further includes a first side edge, the first side edge is arranged between the first end and the second end, and an angle between the first side edge and the thickness direction is 1°-60°.

7. The adapter according to claim 1, characterized in that: The laser scoring includes a first laser scoring and a second laser scoring, the first laser scoring and the second laser scoring intersect each other, and an angle between the first laser scoring and the second laser scoring is 45°-90°.

8. An end cap assembly, characterized in that: The end cap assembly comprises: End cover plate; an electrode terminal connected to the end cover plate; and The adapter as described in any one of claims 1 to 7, wherein the first surface of the adapter is laser welded to the electrode terminal.

9. The end cap assembly according to claim 8, characterized in that: The laser scoring covers the entire second surface; or, The laser score is arranged on the second surface corresponding to the welding area of ​​the first surface.

10. A battery, characterized in that: The battery comprises: An electrode assembly, the electrode assembly comprising a tab; a housing for accommodating the electrode assembly; and The end cap assembly as described in claim 8 or 9, wherein the end cap assembly is connected to the shell so that the electrode assembly is enclosed in the shell, and the second surface of the adapter is connected to the electrode ear.

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